Preparation for low-weightlessness rare earth-iron-boron magnetic body

A rare earth and magnet technology, used in magnetic objects, inductance/transformer/magnet manufacturing, magnetic materials, etc., can solve problems such as poor corrosion resistance and limited application scope

Active Publication Date: 2015-10-07
EARTH PANDA ADVANCE MAGNETIC MATERIAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Rare earth-iron-boron magnets have excellent magnetic properties, but their poor corrosion resistance limits their application range. Therefore, how to improve their corrosion resistance has become an important issue in the production and use of rare earth-iron-boron materials.

Method used

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  • Preparation for low-weightlessness rare earth-iron-boron magnetic body
  • Preparation for low-weightlessness rare earth-iron-boron magnetic body
  • Preparation for low-weightlessness rare earth-iron-boron magnetic body

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Rare earth-iron-boron magnets were prepared as follows, in the smelting step, the NdFeB alloy (RE, PrNd)-(Fe,M)-B composition is PrNd 31 Dy 0.6 Ho 0.6 Al 0.8 co 0.4 Cu 0.2 Ga 0.15 Zr 0.1 Fe 65.04 B 1.01 , the composition of the added nano-alloy RE-MM-N is PrNd35.2 Ti 35 V 29.65 N 0.15 ;

[0025] In the hydrogenation step, the RE-(Fe,M)-B cast sheet and the RE-MM-N steel ingot are hydrogenated separately. First, the pressure of the hydrogenation furnace is pumped down to below 1Pa, and then 0.06MPa is continuously charged into the hydrogenation furnace. Hydrogen, after the hydrogen absorption is complete, heat and dehydrogenate at 500°C to obtain a hydrogenated powder with a particle size within the range of 0.05mm to 2mm;

[0026] In the powder making step, (RE, PrNd)-(Fe, M)-B hydrogenated powder is added to the jet mill, 500ppm of antioxidant and 350ppm of lubricant are added respectively, and the magnetic powder is crushed by supersonic high-pressure nitr...

Embodiment 2

[0035] Rare earth-iron-boron magnets were prepared as follows, in the smelting step, the NdFeB alloy (RE, PrNd)-(Fe,M)-B composition is PrNd 31 Dy 0.6 Ho 0.6 Al 0.8 co 0.4 Cu 0.2 Ga 0.15 Zr 0.1 Fe 65.14 B 1.01 , the composition of the added nano-alloy RE-MM-N is PrNd 32.4 W 6.6 Ti 32.8 Cr 28 N 0.2 ;

[0036] In the hydrogenation step, the RE-(Fe,M)-B cast sheet and the RE-MM-N steel ingot are hydrogenated separately. First, the pressure of the hydrogenation furnace is pumped down to below 1Pa, and then 0.06Mpa is continuously charged into the hydrogenation furnace. Hydrogen, after the hydrogen absorption is complete, heat and dehydrogenate at 520°C to obtain hydrogenated powder with a particle size in the range of 0.05mm to 2mm;

[0037] In the powder making step, (RE, PrNd)-(Fe, M)-B hydrogenated powder is added to the jet mill, 800ppm of antioxidant and 200ppm of lubricant are added, and the magnetic powder is crushed by supersonic high-pressure nitrogen flow,...

Embodiment 3

[0046] Rare earth-iron-boron magnets were prepared as follows, in the smelting step, NdFeB alloy (RE, PrNd)-(Fe,M)-B was PrNd 28.2 Tb 1.0 Dy 2.5 AL 0.3 Cu 0.18 co 0.8 Ga 0.12 Zn 0.1 Fe 65.8 B 1.0 , the composition of the added nano-alloy RE-MM-N is PrNd 32.5 W 4.4 Ti 48.6 Zr 14 N 0.25 ;

[0047] In the hydrogenation step, the RE-(Fe,M)-B cast sheet and the RE-MM-N steel ingot are hydrogenated separately. First, the pressure of the hydrogenation furnace is pumped down to below 1Pa, and then 0.065Mpa is continuously charged into the hydrogenation furnace. Hydrogen, after the hydrogen absorption is complete, heat and dehydrogenate at 530°C to obtain a hydrogenated powder with a particle size within the range of 0.05mm to 2mm;

[0048] In the powder making step, (RE, PrNd)-(Fe, M)-B hydrogenated powder is added to the jet mill, 400ppm of antioxidant and 400ppm of lubricant are added respectively, and the magnetic powder is crushed by supersonic high-pressure nitrogen...

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Abstract

The invention relates to preparation for a low-weightlessness rare earth-iron-boron magnetic body, and belongs to the field of magnetic materials. The preparation comprises the following steps of smelting, hydrogenating, powdering making, powder mixing, orienting and forming, sintering and aging treatment. According to the technical scheme, in the powder mixing process of preparation of a rare earth-iron-boron magnetic body, RE-MM-N nano-alloy is added to rare earth-iron-boron magnetic powder, after sintering and aging heating treatment are carried out, RE-MM-N nanometers are distributed on a grain boundary phase in a scattering mode, the grain boundary of the rare earth-iron-boron magnetic body is strengthened, the difference between the grain boundary abundant RE corrosion potential and the main corrosion potential is lowered, the intergranular corrosion is lowered, the corrosion resistance of the grain boundary phase in the environment of high temperature and high humidity is improved, and the weightlessness of the rare earth-iron-boron magnetic body is lowered. Compared with the general technology of preparing the rare earth-iron-boron magnetic body, the weightlessness is achieved.

Description

technical field [0001] The invention relates to a preparation method of a rare earth permanent magnet, in particular to a preparation method of a low weight loss rare earth-iron-boron magnet, belonging to the field of magnetic materials. Background technique [0002] At present, rare earth magnetic materials have become an indispensable material in people's daily life. Its application involves various fields such as electronics, intelligence information, medical treatment, transportation, machinery, aerospace, etc., especially the popularization of electronic computers, electronic communication and other equipment. With the rapid development of automotive motors, higher requirements are placed on the corrosion resistance of rare earth-iron-boron magnets in high-temperature and high-humidity environments. [0003] Rare earth-iron-boron magnets have excellent magnetic properties, but their poor corrosion resistance limits their application range. Therefore, how to improve thei...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01F41/02H01F1/057B22F9/04B22F3/16
Inventor 李绪亮赵占中黄秀莲陈静武衣晓飞熊永飞
Owner EARTH PANDA ADVANCE MAGNETIC MATERIAL
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